Fix duplicated feed logs

Typing: Tox env, CI job

Docs: add note about dataclass items and loaders

Co-authored-by: NAdrián Chaves <adrian@chaves.io>

Use chain.from_iterable in python.py

give write access to template files after copying with startproject

Code sharing between crawl and runspider command

remove unneeded escape sequence

Extend hoverxref_roles to custom crossrefs (#4495)

Remove _monkeypatches, import-related Flake8 codes

Stop response download from signal handler

Fix KeyError in LocalWeakReferencedCache

[MRG+1] CookiesMiddleware: keep cookies from 'Cookie' request header, fix encoding

None of the existing commands built the docs properly for me (I had to
revert the changes in 901892da to docs/conf.py to get them to build
properly, and even then no tooltips displayed).

Building them with tox worked for me, but other developers say they
can still use the original method, so the docs now contain both.

Incompatible with pytest 5.4 and 5.4.1

removed uneeded wscape sequences from method arguments in the docs
folder

Fix the description of the ScreenshotPipeline example item pipeline